Lilypad MP3 start/stop music

We need the lilypad MP3 to trigger on one simple switch via one trigger point (doesn't matter which one) but only for as long as the button is pressed. Once the button is released we need the music t to stop. It seems like this should be very simple but we can't make it happen.

Any suggestions?

Sure - add some more details about the MP3 unit you are using, your wiring, and post your code.